There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Net Worth: $280 Million. Source: Telecom. Citizenship: Zimbabwe. Zimbabwean businessman and telecom magnate, Strive Masiyiwa has a net worth of $280 million as November 2011, according to FORBES. He is currently the richest person in Zimbabwe.